What's up futuredoc? The way I do it is to shoot through my fist. Mother Nature has blessed us with binocular vision. So I look over my fist and down the arrow shaft with my right eye and to the left of my fist and to the target with my left eye. Then you mentally combine the images and you can aim just fine. You can even do it when your fist is above the target, a possible origin of the term 'underhanded'.
I didn't invent the method. The English longbowmen were doing it a thousand years ago.
OK, OK, there is more. You can add to the sight picture further references like the front of your arrow shelf, the back of it, your arrow rest or plunger on a target recurve, the web of your thumb, and the top of each of your four knuckles.
This is how we can shoot the Field Archery course to 80 yards with a single anchor point. Barebow recurve archery aka Arco Nudo is very popular in Europe and this is one way they do it. - lbg